Think of any valleys that you know between high mountains. Such was southern Arizona once--before we came. Then fill up your valleys with sand until the mountains show no feet or shoulders, but become as men buried to the neck. That is what makes separate islands of their protruding peaks, and that is why water slinks from the surface whenever it can and flows useless underneath, entombed in the original valley. This is Arizona now--since the pterodactyls have gone. In such a place the traveller turns mariner, only, instead of the stars, he studies the water-wells, shaping his course by these. Not sea-gulls, but ravens, fly over this waste, seeking their meal. Some were in front of Genesmere now, settled black in the recent trail of the cattle. He did not much care that the last well was gone by, for he was broken in by long travel to the water of the 'dobe-holes that people rely upon through this journey. These 'dobe-holes are occasional wallows in clayey spots, and men and cattle know each one. The cattle, of course, roll in them, and they become worn into circular hollows, their edges tramped into muck, and surrounded by a thicket belt of mesquite. The water is not good, but will save life. The first one lay two stages from the well, and Genesmere accordingly made an expected dry camp the first night, carrying water from the well in the Santa Cruz, and dribbling all of it but a cupful among his animals, and the second night reached his calculated 'dobe-hole. The animals rolled luxuriously in the brown, dungy mixture, and Genesmere made his coffee strong. He had had no shade at the first camp, and here it was good under the tangle of the mesquite, and he slept sound. He was early awakened by the ravens, whose loose, dislocated croaking came from where they sat at breakfast on the other side of the wallow. They had not suspected his presence among the mesquite, and when he stepped to the mud-hole and dipped its gummy fluid in his coffee-pot they rose hoarse and hovering, and flapped twenty yards away, and sat watching until he was gone into the desert, when they clouded back again round their carrion.